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ABSTRACT

WITH THE INLET SIDE OF THE FLOW-CONTROL PORTIONS OF THE VALVE ASSEMBLY AND THE OUTLET SIDE OF THE PRESSURE-RELIEF PORTIONS. A POSITIVE DISPLACEMENT PUMP ADAPTED ESPECIALLY FOR USE IN POWER STEERING SYSTEMS FOR AUTOMOTIVE VEHICLES COMPRISING A PUMP HOUSING, A PUMP CAM AND ROTOR ASSEMBLY RECEIVED WITHIN THE HOUSING, PORTED PRESSURE PLATES SITUATED ON OPPOSED SIDES OF THE CAM AND ROTOR ASSEMBLY, THE OUTERMOST PRESSURE PLATE BEING SECURED FAST TO THE HOUSING AND THE INNERMOST PRESSURE PLATE BEING URGED INTO SEALING ENGAGEMENT WITH THE CAM AND ROTOR ASSEMBLY AND COOPERATING WITH THE HOUSING TO DEFINE A HIGH PRESSURE REGION WHICH COMMUNICATES WITH A PRESSURE-RELIEF AND FLOW-CONTROL VALVE ASSEMBLY IN THE HOUSING AND A RESERVOIR SURROUNDING THE HOUSING AND COMMUNICATING

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice 0! Dec. 16, 1969, 869 DE. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Oiiice make: no assertion as to the novelty of the disclosed subject matter.

PUBLISHED OCTOBER 1, 1974 T927,009 COMPACT POSITIVE DISPLACEMENT PUMP Glenn A. Ulrich, Birmingham, Mich assignor to Ford Motor Company, Dearborn, Mich.

Continuation of application Ser. No. 187,104, Oct. 8,

1971. This application Oct. 23, 1973, Ser. No. 408,713

Int. Cl. Ffllc 19/10 US. Cl. 418-133 6 Sheets Drawing. 12 Pages Specification A positive displacement pump adapted especially for use in power steering systems for automotive vehicles comprising a pump housing, a pump cam and rotor assembly received Within the housing, ported pressure plates situated on opposed sides of the cam and rotor assembly, the outermost pressure plate being secured fast to the housing and the innermost pressure plate being urged into sealing engagement with the cam and rotor assembly and cooperating with the housing to define a high pressure region which communicates With a pressure-relief and flow-control valve assembly in the housing and a reservoir surrounding the housing and communicating with the inlet side of the flow-control portions of the valve assembly and the outlet side of the pressure-relief portions.

Oct. 1, 1974 ULRICH T927,009

COMPACT POSITIVE DISPLACEMENT l'UMP Original Filed Oct 8 L971 6 Sheets-Sheet 1 Oct. 1, 1974 ULR|CH I T927,009

COMPACT POSITIVE DISPLACEMENT PUMP Original Filed Oct. 8. i971 6 Sheets-Sheet J 06L 1974 G. A. ULRICH T927,009

COMPACT POSITIVE DISPLACEMENT PUMP Original Filed Oct. 8, 1971 6 Sheets-Sheet 4 Oct. 1, 1974 G. A. ULRICH T927,009

COMPACT POSITIVE DISPLACEMENT PUMP Original Filed Oct. 8. 1971 6 Sheets-Sheet 5 Oct. 1, 1974 ULRICH TQZ'LOUQ COMPACT POSITIVE DISPLACEMENT PUMP Original Filed Oct. 8. 1971 6 Sheets-Sheet B 

